A mathematical model for calculating total transmission of solar radiation through shuttle louvers and experimental verification

Journal of Asian Architecture and Building Engineering

Tao

2020

Self Cite

Shading louvers are widely used in buildings to protect the indoor environment from excessive heat gain, especially in hot climatic regions. However, few studies mentioned their influences on wind characteristics. As a type of external components on building facades, shading louvers play an important role in wind-induced physical fields, such as wind pressure distribution and airflow pattern. The purposes of this paper are to analyse the impact of computational parameters on simulation results and evaluate the cross-ventilation capacity of a low-rise building with shading louvers. The rotation angle of shading louvers is considered. The simplified engineering model and the coupled indoor and outdoor airflow model are introduced to perform cross-ventilation evaluation. The sensitive analysis shows that the turbulence model has the greatest impact on numerical results. The evaluation of cross ventilation shows that the simplified model fails to quantify the cross-ventilation capacity for some cases. Based on the coupled airflow model, the largest reduction of ventilation rate is up to 66.6%. This study has performed the first sensitive analysis for airflow fields around the building with shading louvers, which provides a detailed simulation guidelines. The results of cross-ventilation capacity influenced by the shading louvers is helpful for ventilation design.

Section: Introductionmentioning

confidence: 99%

Numerical study of wind environment of a low-rise building with shading louvers: sensitive analysis and evaluation of cross ventilation

Journal of Asian Architecture and Building Engineering

Tao

2020

Self Cite

“…Building energy consumption accounts for a large proportion of the total energy consumption and is one of the important links in promoting energy conservation and emission reduction, which has attracted great attention. As a passive building technology for energysaving, shading devices are usually used to reduce solar radiation entering units to reduce energy consumption of air-conditioning systems [1,2]. In addition, shading devices have an influence on natural ventilation during the transitional seasons and can change the indoor environment and air quality while satisfying indoor light and thermal conditions.…”

Section: Introductionmentioning

confidence: 99%

Impact of shading louvers on wind-driven single-sided ventilation in a multi-storey building

Tao²

2022

E3S Web Conf.

Self Cite

As a passive building energy-saving technology, shading systems are usually used to reduce the solar radiation into the unit and reduce the energy consumption of air conditioning system. For multi-storey buildings, shading devices can not only change the indoor thermal environment, but also change the indoor wind environment and air quality because their impact on airflow patterns of natural ventilation. In this paper, the numerical simulation method was used to investigate external shading louvers on the single-sided ventilation performance and indoor air quality of units at different positions in a multi-storey building. Three approaching airflow directions and three rotation angles of louvers were considered and analysed. The results show that the evaluation of ventilation performance of shading louvers in multi-storey buildings is important for shaded buildings, which provide a new perspective for the geometry design of shading louvers and ventilation design of buildings.

“…Therefore, shading louvers are also applied in other climate regions to provide a better visual environment [3]. The previous research in shading devices mainly focused on the potentialities of energy saving [4], environmental influences [5], optical and thermal performances [5][6][7], as well as visual and thermal comfort for buildings under shaded conditions [5,8]. However, the performance of natural ventilation in a building is also significantly related to components on building surfaces [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Wind Pressure Coefficient on a Multi-Storey Building with External Shading Louvers

Tao

2020

Applied Sciences

Self Cite

Wind characteristics on building surfaces are used to evaluate natural ventilation of a building. As a type of building component, external shading louvers are applied in hot climatic regions to block solar radiation and provide better visual environments. The structure of external louvers can affect wind-induced characteristics, such as convective heat transfer coefficient, wind pressure and pollutant dispersion around building envelopes. This paper aims to analyze the potential ventilation capacity of a multi-storey building with shading louvers, based on wind pressure coefficient by the numerical method. A reference case was established and a previous study was applied to validate the numerical results. The rotation angle of horizontal louvers is taken from 0° to 75° in the simulation cases. The results show that average wind pressure has the greatest reduction for all floors when rotation angle turns from 60° to 75°. Ventilation openings on the stagnation zone contribute to higher ventilation rates for the windward facade with louvers. The analysis, based on multi-floor and multi-row buildings under shaded conditions, will provide a greater perspective for engineers to make optimal natural ventilation routes in multi-storey buildings with external shading louvers.